CN202676861U - Motor insulation leakage current signal monitoring device - Google Patents
Motor insulation leakage current signal monitoring device Download PDFInfo
- Publication number
- CN202676861U CN202676861U CN 201220330787 CN201220330787U CN202676861U CN 202676861 U CN202676861 U CN 202676861U CN 201220330787 CN201220330787 CN 201220330787 CN 201220330787 U CN201220330787 U CN 201220330787U CN 202676861 U CN202676861 U CN 202676861U
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- motor
- current transformer
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- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The utility model provides a motor insulation leakage current signal monitoring device which comprises a zero magnetic flux current transformer, a voltage signal acquisition unit, a power supply unit, an analog signal processing unit, an RS485 communication circuit, a data storage unit, a data processing unit and a display unit. The zero magnetic flux current transformer is connected with the analog signal processing unit. The voltage signal acquisition unit is connected with the data processing unit. The analog signal processing unit is connected with the data processing unit. The data processing unit is respectively connected with the display unit, the RS485 communication circuit and the data storage unit. The power supply unit supplies power for the device. A multilayer shielding structure is employed by the zero magnetic flux current transformer. The device can accurately and continuously monitor the insulation condition of a motor in operation when the motor is in an operating condition, and the motor insulation leakage current signal monitoring device has the advantages of strong anti-interference performance.
Description
Technical field
The utility model relates to the electric measurement field, is specifically related to a kind of motor insulating leakage current signal monitoring device.
Background technology
Alternating current generator is just towards the high voltage large capcity future development, because the effect of stress of electricity, heat, machinery and environment, the insulation system of motor wears out gradually, winding produces loosening, the insulation layering, even in the path that winding overhang produces electricity, because the electrical strength of insulation system reduces, often cause insulation fault.The stator winding insulation fault is one of major failure of large ac machines; When equipment is not deposited Insulation Problems, may cause damage to original good motor, cause the consumption of the costliness of human, financial, and material resources power.Owing to the reason on the manufacturing process, may there be air gap between insulation course inside or insulation course and the layer line, when having air gap between insulation course inside or insulation course and the layer line or because during electric, hot etc. effect formation air gap, the globality of motor insulation over the ground is destroyed.When there is defective in insulation course, along with the rising of voltage and the enhancing of electric field intensity, exist the position of air gap will produce in various degree electric discharge phenomena, this fine electric discharge phenomena are extremely harmful to insulating, various testing result explanations, in the certain hour scope, the increase of partial discharge phenomenon, making winding form dangerous ageing process probability increases.Therefore Partial Discharge Detection can distinguish whether (diagnosis) high-voltage AC motor insulation status is good.
Summary of the invention
The purpose of this utility model is to provide a kind of state of insulation that can monitor at any time motor and with the Monitoring Data real-time storage with upload to the motor insulating leakage current signal monitoring device of host computer.
The purpose of this utility model is achieved in that a kind of motor insulating leakage current signal monitoring device, it comprises zero-flux current transformer, the voltage signal acquisition unit, power supply unit, analogy signal processing unit, the RS485 telecommunication circuit, data storage cell, data processing unit and display unit, zero-flux current transformer connecting analog signal processing unit, voltage signal acquisition unit connection data processing unit, analogy signal processing unit connection data processing unit, data processing unit connects respectively display unit, the RS485 telecommunication circuit, data storage cell, power supply unit is the power supply of this device, and zero-flux current transformer adopts the multilayer screen structure.
This device can be under the motor operating condition, accurately, the insulation status during operation of continuous monitoring motor, has the advantage of strong interference immunity.
Description of drawings
Fig. 1 is the utility model motor insulated on-line monitoring instrument structural topology figure,
Wherein 1, zero-flux current transformer, 2, analogy signal processing unit, 3, display unit, 4, data processing unit, 5, power supply unit, 6, the RS485 telecommunication circuit, 7, data storage cell, 8, the voltage signal acquisition unit.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is further described:
Embodiment 1:
A kind of motor insulating leakage current signal monitoring device, it comprises zero-flux current transformer 1, voltage signal acquisition unit 8, power supply unit 5, analogy signal processing unit 2, RS485 telecommunication circuit 6, data storage cell 7, data processing unit 4 and display unit 3, zero-flux current transformer 1 connecting analog signal processing unit 5, voltage signal acquisition unit 8 connection data processing units 7, analogy signal processing unit 2 connection data processing units 4, data processing unit 4 connects respectively display unit 3, RS485 telecommunication circuit 6, data storage cell 7, power supply unit 5 adopts the multilayer screen structure for this device power supply, zero-flux current transformer 1.Generalized case, local discharge signal are very faint, but it has the abundant information about insulation, therefore, the on-line monitoring discharge signal is analyzed its internal feature, can point out decreasing insulating, the progressive formation of dielectric breakdown provides each alarm in advance, prevents the more generation of major accident.The on-line monitoring of motor must carry out at the scene, large-size machine operation site environment is very abominable, produce a large amount of undesired signals when electric system or motor operation and will affect detection, the amplitude of this interference even than much larger times of the local discharge signal amplitude that will measure, and usually overlapping on frequency range.Therefore how effectively get rid of and disturb, the elimination noise is on the impact of online measurement of partial discharge, with obtain truly, measured signal is vital reliably.This two aspect of this paper reduces various interference to the impact of electrical machine insulation monitoring, the one, the design of sensor and shield technology, the 2nd, the interference protection measure in the testing signal process.Near voltage signal acquisition: motor insulated on-line monitoring instrument is installed in the motor working condition measuring instrument, the secondary voltage signal that is used for the measuring voltage mutual inductor, the sample of signal mode of connection is as follows: press signal in the terminal box power taking, cause motor insulated on-line monitoring instrument voltage signal acquisition unit.Insulating signal gathers: the neutral point of threephase motor is opened, after three phase winding first and last ends penetrate zero magnetic flux punching sensor, again with the terminal closed neutral point that forms of three phase windings.Analogy signal processing unit amplifies, after filtering, measurement range selection etc. process, signal is outputed to data processing unit zero magnetic flux punching sensor signal.Data are processed and 14 A/D samplings of display unit control, convert the electrical signal to digital signal, microprocessor adopts harmonic analysis method to analyze to digital signal sequences, carries out frequency-domain analysis by the Fourier pair signal again, calculates at last signal effective value, phase place, dielectric dissipation factor; Through repeatedly measuring and digital filtering method calculates the motor such as stable leakage current electric current, dielectric dissipation factor, insulation resistance and moves insulation parameter, show and be uploaded to host computer.
Claims (1)
1. motor insulating leakage current signal monitoring device, it comprises zero-flux current transformer, the voltage signal acquisition unit, power supply unit, analogy signal processing unit, the RS485 telecommunication circuit, data storage cell, data processing unit and display unit, it is characterized in that: zero-flux current transformer connecting analog signal processing unit, voltage signal acquisition unit connection data processing unit, analogy signal processing unit connection data processing unit, data processing unit connects respectively display unit, the RS485 telecommunication circuit, data storage cell, power supply unit is the power supply of this device, and zero-flux current transformer adopts the multilayer screen structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220330787 CN202676861U (en) | 2012-07-10 | 2012-07-10 | Motor insulation leakage current signal monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220330787 CN202676861U (en) | 2012-07-10 | 2012-07-10 | Motor insulation leakage current signal monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202676861U true CN202676861U (en) | 2013-01-16 |
Family
ID=47497758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220330787 Expired - Fee Related CN202676861U (en) | 2012-07-10 | 2012-07-10 | Motor insulation leakage current signal monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202676861U (en) |
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2012
- 2012-07-10 CN CN 201220330787 patent/CN202676861U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 Termination date: 20130710 |